Oil headed for the biggest weekly loss since March as the spread of the delta coronavirus variant cast doubt on the continued recovery in demand, particularly in the world’s biggest crude importer China. West Texas Intermediate, which traded above $69 a barrel on Friday, has shed 5.9% so far this week, the biggest decline since the period to March 19. A surprise expansion in U.S. crude oil stockpiles has also hurt prices. China has imposed a patchwork of increasingly strict restrictions on mobility to fight the spread of the highly infectious Covid-19 variant, including the cancellation of some flights and train services. On Friday, the nation reported 101 infections, including 21 people who are asymptomatic, the biggest daily increase in more than […]